Metrics question
What would be the top six metrics for WhatsApp? Now pick one from the six. Tell me three things you would do to improve that metric.
- Metrics
- Medium
Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.
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What this question tests
Ability to build a metric tree for a messaging product and translate one metric into concrete product actions.
How to approach it
- State WhatsApp's core value: fast, reliable, private messaging, so metrics should tie back to that.
- List six candidates: messages sent, DAU/MAU, message delivery latency, media send success rate, group creation rate, and call completion rate.
- Pick one, for example message delivery latency, since reliability is core to trust in messaging.
- Break latency into causes: network conditions, server load, and client side retry logic.
- Propose three fixes: regional server capacity increases, smarter offline queuing, and compression for media on weak networks.
- Confirm success by tracking p95 delivery latency and message failure rate after each change.
What a strong answer includes
- Picks a metric tied to trust and reliability, not just volume, since WhatsApp's differentiation is dependability.
- Gives a concrete illustrative baseline, e.g. assumes p95 delivery latency is 3 seconds and targets under 1.5 seconds.
- Proposes actions with different mechanisms (infra, client logic, compression) instead of three variations on the same idea.
- Notes a guardrail: battery and data usage should not regress while chasing latency.
Common mistakes
- Listing six generic metrics without picking one and going deep, which the question explicitly asks for.
- Proposing three fixes that are really the same idea restated.
- Ignoring guardrails like data cost or battery drain when optimizing the chosen metric.
Likely follow-up questions
- Why did you pick that metric over the others?
- How would you measure impact on low end devices?
- What tradeoff would you accept to hit this target?
More metrics questions
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- Utilization went down by 45% on app XYZ in Italy for the month of August. Give a reason why and draft a plan to fix it.Spotify · Metrics · Medium
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- Define the metrics for YouTube search.Google · Metrics · Medium
- You walk in to your office and find that Google cloud subscription has gone down by 20%. What do you do as a product manager?Google · Metrics · Medium
- How do you measure the success of Google Search?Google · Metrics · Medium
More questions from Google
Learn the skill behind it
Chapters of the AI PM course that teach what this question tests.
- Chapter 9: Prove it paid off: outcomes, economics, and pricing
- Chapter 2: Data fluency: SQL, logs, and reading the truth yourself
- Chapter 14: Get the job: the AI PM interview loop